摘要
为解决低品位高硫铝土矿工业应用中硫含量过高及溶出问题,采用低温焙烧技术路线,考察焙烧温度、焙烧时间及矿石粒径对焙烧脱硫的影响。结果表明,最佳焙烧脱硫条件为:焙烧温度650℃、焙烧时间180s、矿石粒径48μm。在该条件下铝土矿硫脱除率达到75.83%,焙砂中硫含量为0.29%。相同条件下焙烧矿氧化铝相对溶出率为97.63%,较原矿提高了7.32个百分点。铝土矿中硫主要以黄铁矿形式存在,在焙烧过程黄铁矿优先于一水铝石与高岭石反应。
To address digestion of low grade and high sulfur bauxite in industrial application,effects of roasting temperature,roasting time and ore particle size on desulfurization by low-temperature roasting were investigated.The results show that sulfur removal rate of bauxite is 75.83% with sulfur content in ore of 0.29%under the optimum roasting desulfurization conditions including roasting temperature of 650 ℃,roasting time of180 s,and ore particle size of 48μm.Under the same digestion conditions,relative dissolution rate of alumina from roasted ore is 97.63%,which is 7.32 percent point higher than that of raw ore.Sulfur in bauxite mainly exists in form of pyrite,which is prior reaction with kaolinite to boehmite during roasting.
作者
马兴飞
张强
张姗姗
MA Xing-fei;ZHANG Qiang;ZHANG Shan-shan(College of Mechanical Engineering,Shangqiu Institute of Technology,Shangqiu 476000,Henan,China;College of Material and Metallurgy,Guizhou University,Guiyang 550025,China;Guizhou Province Key L.aboratory of Metallurgical Engineering and Process Energy Saving,Guiyang 550025,China;State Key Laboratory of Pressure Hydrometallurgical Technology of Associated Nonferrous Metal Resources,Kunming 650503,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2021年第6期32-36,共5页
Nonferrous Metals（Extractive Metallurgy)
基金
国家自然科学基金资助项目(51774079)。
关键词
低品位
高硫
焙烧
铝土矿
low grade
high sulfur
roasting
bauxite
